qinglan.Canvas.ParticleModel = qinglan.Canvas.Class(function(id, opt){
	this.id = id;

	this.opt = opt;
}).methods({
	setOpt: function(opt){
		this.opt = opt;
	},
	update: function(particle){
		throw 'The rewritePosition function must be implemented!';
	}
}).statics({

});
